Home / 87,938.40-131,821.20-78,607.20

Finding the Fourth Proportional to 87,938.40, 131,821.20 and 78,607.20

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Solution

The fourth proportional to 87,938.40, 131,821.20 and 78,607.20 is: 117,833.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,938.40 : 131,821.20 = 78,607.20 : x
  2. Step 2: Convert to fraction form
    87,938.40/131,821.20 = 78,607.20/x
  3. Step 3: Cross multiply
    87,938.40x = 131,821.20 × 78,607.20
  4. Step 4: Simplify right side
    87,938.40x = 10,362,095,432.64
  5. Step 5: Solve for x
    x = 10,362,095,432.64/87,938.40
  6. Step 6: Final answer
    x = 117,833.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.